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OK. Maybe I missed it, but what is causing the dented case mouth? I have this on almost all my spent casing and it is not a huge problem, but it is very irritating. Please advise or call me an idiot and refer me to the post that explains it. Thanks in advance.

1) Most commonly it is striking the deflector behind the ejection port. That's why the deflector is there. If you don't like the dented case mouths, put a piece of the loop (soft) side of velcro there and it will disappear.

There is a permanent fix, and that requires shortening the ejector spring very slightly, and there is a link to directions on how to do that on the board.

”You seek escape from pain. We seek the achievement of happiness. You exist for the sake of avoiding punishment. We exist for the sake of earning rewards. Threats will not make us function; fear is not our incentive. It is not death that we wish to avoid, but life that we wish to live.” - John Galt

you may have trimmed the spring too short, but you may be fine with a gas adjustment. many things can affect ejection/extraction, I usually go very little on the ejector spring to check the reaction, usually do it at the range, since you also have an adjustable gas block, put some more gas through it

on your last shot did the bolt lock open? try shooting one shot at a time from the mag and see if your bolt locks open and if the rounds eject, increase gas slowly to see what happens and if you can get the rounds to eject and what the angle is, then load up a magazine with 5 rounds and try again

Did you change the extractor spring? At least bring a new one and the tools to swap it out at the range. Most people are very helpful at the range-if you need the extra 3 hands., they will step up. Good luck, we all hate an unreliable rifle.

The first case ejected had the body dent...reduced the gas and the cases did not have the dent (nor collapsed neck). The cases are still ejected further than I'd like but there is no damage to the spent cases (which is the main goal).

Good job Bjorn, the ejector spring needs to stay close to stock length=1.5--2.0 coils cut- is all that's needed... I'll have to install the adj. gas block soon. I guess you got lucky on extractor spring issues, for now....

My "other" Grendel is an AA Entry...no extraction issues whatsoever. I'll probably trim its ejector spring 1.5 coils since it also has a propensity to deform spent case necks. I wish I had an adjustable block for it...

Hey i am new to site but i have had trouble with dented brass went through alot trying to figure out why it was shaving brass and denting the brass i changed the buffer spring to try and slow cycle changed stock buff and spring agian did not change sent it to jt said it was fine and sent me adjustable gas block wrong size so gave up at that point me and a buddy was reloading some brass and tried a littel hotter load and guess what the brass came out with no dents my load was 123 amax hodgdon blc2 powder 31.8 grains cci primer it tighted up my group to 100 yards 3 shots dime size

The first case ejected had the body dent...reduced the gas and the cases did not have the dent (nor collapsed neck). The cases are still ejected further than I'd like but there is no damage to the spent cases (which is the main goal).

Have not messed with extractor spring and have no intentions.

It doesn't take much. Always a good idea to have an extra couple of springs on hand before starting any "dremel gun smithing"

1) Most commonly it is striking the deflector behind the ejection port. That's why the deflector is there. If you don't like the dented case mouths, put a piece of the loop (soft) side of velcro there and it will disappear.

Take a 1-1.5 coil -off, Then try different buffer wts., say h1-h2. rasp knows his velocities. We both have an awesome ejector setup. Always have an extra eject spring , or 3-- if in tweak mode. Cheap to buy.